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- Title
The Effect of Current Low Back Pain on Volitional Preemptive Abdominal Activation During a Loaded Forward Reach Activity.
- Authors
Nagar, Vittal R.; Hooper, Troy L.; Dedrick, Gregory S.; Brismée, Jean-Michel; McGalliard, Michael K.; Sizer, Phillip S.
- Abstract
<bold>Background: </bold>A volitional preemptive abdominal contraction (VPAC) supports trunk stability during functional activity. Pain-free individuals can sustain VPAC during function, but such has not been reported for individuals with current low back pain (cLBP).<bold>Objective: </bold>To examine whether cLBP affects VPAC performance during a loaded forward reach (LFR) task.<bold>Design: </bold>Observational crossover study.<bold>Setting: </bold>Laboratory.<bold>Participants: </bold>A total of 18 controls and 17 subjects with cLBP with pain ratings of 1/10 to 4/10 on a visual analog scale.<bold>Interventions: </bold>Transverse abdominis (TrA) thickness measurements were recorded by blinded researchers from M-mode ultrasound imaging during 4 conditions: (1) quiet standing without abdominal drawing-in maneuver (ADIM); (2) quiet standing with ADIM; (3) LFR without ADIM; and (4) LFR with ADIM. A physical therapist with 29 years of experience collected historical and examination data.<bold>Main Outcome Measures: </bold>TrA muscle thickness (mm).<bold>Results: </bold>A 2 (group) × 2 (contraction) × 2 (reach) analysis of variance demonstrated a significant group × contraction interaction (F [1, 31] = 4.499, P = .04) where ADIM produced greater TrA thickness increases in PLBP subjects (2.18 mm) versus controls (1.36 mm). We observed a significant main effect for reach (F [1, 31] = 14.989, P < .001), where LFR activity produced a greater TrA thickness (6.15 ± 2.48 mm) versus quiet standing (5.30 ± 2.12 mm).<bold>Conclusions: </bold>Subjects with cLBP demonstrated a greater increase in TrA activation during ADIM versus controls.
- Subjects
ABDOMINAL muscles; CROSSOVER trials; MUSCLE contraction; ULTRASONIC imaging; LUMBAR pain
- Publication
PM & R: Journal of Injury, Function & Rehabilitation, 2017, Vol 9, Issue 2, p127
- ISSN
1934-1482
- Publication type
journal article
- DOI
10.1016/j.pmrj.2016.05.019